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Excretion as an example of homeostatic control: OCR A‑Level Biology A questions

Every OCR A-Level Biology A exam question on 5.1.2 Excretion as an example of homeostatic control, 2016–2025, with its mark scheme and examiner’s report.

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1,984 questions

  1. Q10

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 10: The diagram shows part of a liver lobule. F E G H I Which statement about liver function is correct? A Blood flows from I towards G. B H carries blood arriving

  2. Q11

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 11: The photomicrograph shows a stained section of liver tissue. J What is the structure labelled J? A Hepatic artery B Hepatic portal vein C Hepatic vein D Sinusoi

  3. Q12

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 12: Which statement describes urea production in the liver? A Amino acids enter the ornithine cycle. B Ammonia and carbon dioxide combine to make urea in the Krebs

  4. Q18(a)(i)

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(a)(i): State one other type of drug on the list of banned substances that can be detected in urine samples. [1]

  5. Q18(a)(ii)

    June 2024 · Paper 1

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(a)(ii): Furosemide can also be misused by jockeys or boxers who need to be below a certain weight. Explain how a diuretic could help to reduce weight. [2]

  6. Q18(a)(iii)

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(a)(iii): Furosemide is a banned substance because it can be used as a masking agent, to hide the use of performance enhancing drugs. Suggest how furosemide could act as

  7. Q18(b)(i)

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(b)(i): Bladder cancer can be diagnosed by surgical removal of a small piece of bladder tissue (a biopsy sample). State one advantage of urine analysis over a biopsy sa

  8. Q18(b)(ii)

    June 2024 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(b)(ii): Give one other application of urine analysis in diagnosis. State the substance measured and the corresponding medical condition. Substance Medical condition [1]

  9. Q18(d)

    June 2024 · Paper 1

    6 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2024 Paper 1, question 18(d): (d)* Describe the homeostatic mechanisms that regulate the water content of the blood by changing how much water is reabsorbed from the collecting duct. You do

  10. Q16(d)

    June 2023 · Paper 1

    4 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 16(d): Changes to kidney function during pregnancy can be confused with some diseases, such as chronic kidney disease or kidney failure. The estimated glomerular filtr

  11. Q19(a)

    June 2023 · Paper 1

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 19(a): Which statements about excretion and homeostasis are true, and which are false? Tick (✓) one box in each row. Statement True False The liver, kidneys, lungs and

  12. Q19(b)(i)

    June 2023 · Paper 1

    3 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 19(b)(i): Fig. 19.1 is a drawing of a longitudinal section of a kidney. Fig. 19.1 T U V Identify the parts of the kidney labelled T, U and V. T U V [3]

  13. Q19(b)(ii)

    June 2023 · Paper 1

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 19(b)(ii): Fig. 19.2 is a photomicrograph of a cross-section of part of the kidney. Fig. 19.2 × 360 Using the letter T, U or V from Fig. 19.1, identify the part of the kid

  14. Q19(c)(i)

    June 2023 · Paper 1

    3 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 19(c)(i): Complete the table using the most appropriate letter or letters, W to Z, to show which part(s) of the nephron correspond to each of the statements. Each letter

  15. Q19(c)(ii)

    June 2023 · Paper 1

    3 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    June 2023 Paper 1, question 19(c)(ii): Fig. 19.3 shows an increasing solute concentration. Outline the processes in the loop of Henle that cause the solute concentration to increase. [3]

  16. Q1

    November 2021 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    November 2021 Paper 1, question 1: Which of the options is not a function of the liver? A production of urea in the ornithine cycle B removal of amino groups from amino acids C storage of excess

  17. Q9

    November 2021 · Paper 1

    1 mark5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    November 2021 Paper 1, question 9: The figure shows the results of three pregnancy tests using test strips with mobile and fixed (immobilised) monoclonal antibodies that bind to human chorionic g

  18. Q18(a)(i)

    November 2021 · Paper 1

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    November 2021 Paper 1, question 18(a)(i): Identify the structures labelled N and O in Fig. 18.1. N O [2]

  19. Q18(a)(ii)

    November 2021 · Paper 1

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    November 2021 Paper 1, question 18(a)(ii): The walls of the structure labelled M in Fig. 18.1 are lined with cells. Suggest and explain how these cells are adapted to carry out their function. [2]

  20. Q1(a)

    November 2020 · Paper 3

    2 marks5.1.2 Excretion as an example of homeostatic control
    The whole paper ↗
    November 2020 Paper 3, question 1(a): A student dissected a kidney. Fig. 1.1 shows one half of the dissected kidney. Fig. 1.1 Draw a simple diagram of the kidney in Fig. 1.1 in the space below. On y
All 44 questions on Excretion as an example of homeostatic control, as a list
  1. June 2024, Paper 1, Q10 (1 mark): The diagram shows part of a liver lobule. F E G H I Which statement about liver function is correct? A Blood flows from I towards G. B H carries blood arriving
  2. June 2024, Paper 1, Q11 (1 mark): The photomicrograph shows a stained section of liver tissue. J What is the structure labelled J? A Hepatic artery B Hepatic portal vein C Hepatic vein D Sinusoi
  3. June 2024, Paper 1, Q12 (1 mark): Which statement describes urea production in the liver? A Amino acids enter the ornithine cycle. B Ammonia and carbon dioxide combine to make urea in the Krebs
  4. June 2024, Paper 1, Q18(a)(i) (1 mark): State one other type of drug on the list of banned substances that can be detected in urine samples. [1]
  5. June 2024, Paper 1, Q18(a)(ii) (2 marks): Furosemide can also be misused by jockeys or boxers who need to be below a certain weight. Explain how a diuretic could help to reduce weight. [2]
  6. June 2024, Paper 1, Q18(a)(iii) (1 mark): Furosemide is a banned substance because it can be used as a masking agent, to hide the use of performance enhancing drugs. Suggest how furosemide could act as
  7. June 2024, Paper 1, Q18(b)(i) (1 mark): Bladder cancer can be diagnosed by surgical removal of a small piece of bladder tissue (a biopsy sample). State one advantage of urine analysis over a biopsy sa
  8. June 2024, Paper 1, Q18(b)(ii) (1 mark): Give one other application of urine analysis in diagnosis. State the substance measured and the corresponding medical condition. Substance Medical condition [1]
  9. June 2024, Paper 1, Q18(d) (6 marks): (d)* Describe the homeostatic mechanisms that regulate the water content of the blood by changing how much water is reabsorbed from the collecting duct. You do
  10. June 2023, Paper 1, Q16(d) (4 marks): Changes to kidney function during pregnancy can be confused with some diseases, such as chronic kidney disease or kidney failure. The estimated glomerular filtr
  11. June 2023, Paper 1, Q19(a) (2 marks): Which statements about excretion and homeostasis are true, and which are false? Tick (✓) one box in each row. Statement True False The liver, kidneys, lungs and
  12. June 2023, Paper 1, Q19(b)(i) (3 marks): Fig. 19.1 is a drawing of a longitudinal section of a kidney. Fig. 19.1 T U V Identify the parts of the kidney labelled T, U and V. T U V [3]
  13. June 2023, Paper 1, Q19(b)(ii) (2 marks): Fig. 19.2 is a photomicrograph of a cross-section of part of the kidney. Fig. 19.2 × 360 Using the letter T, U or V from Fig. 19.1, identify the part of the kid
  14. June 2023, Paper 1, Q19(c)(i) (3 marks): Complete the table using the most appropriate letter or letters, W to Z, to show which part(s) of the nephron correspond to each of the statements. Each letter
  15. June 2023, Paper 1, Q19(c)(ii) (3 marks): Fig. 19.3 shows an increasing solute concentration. Outline the processes in the loop of Henle that cause the solute concentration to increase. [3]
  16. November 2021, Paper 1, Q1 (1 mark): Which of the options is not a function of the liver? A production of urea in the ornithine cycle B removal of amino groups from amino acids C storage of excess
  17. November 2021, Paper 1, Q9 (1 mark): The figure shows the results of three pregnancy tests using test strips with mobile and fixed (immobilised) monoclonal antibodies that bind to human chorionic g
  18. November 2021, Paper 1, Q18(a)(i) (2 marks): Identify the structures labelled N and O in Fig. 18.1. N O [2]
  19. November 2021, Paper 1, Q18(a)(ii) (2 marks): The walls of the structure labelled M in Fig. 18.1 are lined with cells. Suggest and explain how these cells are adapted to carry out their function. [2]
  20. November 2020, Paper 3, Q1(a) (2 marks): A student dissected a kidney. Fig. 1.1 shows one half of the dissected kidney. Fig. 1.1 Draw a simple diagram of the kidney in Fig. 1.1 in the space below. On y
  21. November 2020, Paper 3, Q1(b)(i) (1 mark): State one function of the distal convoluted tubule. [1]
  22. November 2020, Paper 3, Q1(b)(ii) (1 mark): Describe the function of the structures labelled A in Fig. 1.2. [1]
  23. November 2020, Paper 3, Q1(b)(iii) (1 mark): Suggest which lumen, B or C, has the highest concentration of urea. Explain your answer. [1]
  24. November 2020, Paper 3, Q1(c) (6 marks): (c)* Water reabsorption in the kidney is controlled by the endocrine and nervous systems. Aldosterone and ADH are hormones that act on the kidney. Aldosterone c
  25. November 2020, Paper 3, Q1(d)(i) (1 mark): Suggest which of the diuretics, X, Y or Z, would be the most effective at reducing a person’s blood pressure. Explain your choice. diuretic explanation [1]
  26. November 2020, Paper 3, Q1(d)(ii) (1 mark): Suggest which of the diuretics, X, Y or Z, would be the most appropriate for use by a person with type II diabetes. Explain your choice. diuretic explanation [1
  27. November 2020, Paper 3, Q6(c) (2 marks): When old red blood cells are broken down, each haem group is converted to a molecule called bilirubin. Bilirubin passes through the digestive system. Bilirubin
  28. June 2019, Paper 1, Q12 (1 mark): Damage to the hypothalamus results in lower water potential of the blood. Which of the following, A to D, explains these observations? A ADH release increases t
  29. June 2019, Paper 1, Q19(c)(i) (3 marks): Calculate the change in the number of samples testing positive for testosterone between 1988 and 1991. number of samples = [3]
  30. June 2019, Paper 1, Q19(c)(ii) (6 marks): Resistance training with weights can increase muscle mass in the body. It can also lead to vascularisation, where blood vessels become more visible through the
  31. June 2018, Paper 1, Q10 (1 mark): One treatment for thyroid cancer is radioactive iodine. The radioisotope I131 is used. The thyroid gland absorbs any iodine that enters the body, so the radioac
  32. June 2018, Paper 1, Q23(a) (3 marks): A student looked at slides of different tissues under a light microscope. The four viewed images are labelled W, X, Y and Z in Fig. 23.1, on the insert. Identif
  33. June 2018, Paper 3, Q6(a) (6 marks): The process of ultrafiltration in the kidney shares similarities with the formation of tissue fluid. (a)* Describe the similarities and differences between ultr
  34. June 2018, Paper 3, Q6(b)(i) (4 marks): Suggest two characteristics of a patient that must be taken into account when using this GFR measurement to diagnose kidney damage. Explain why each characteris
  35. June 2018, Paper 3, Q6(b)(ii) (1 mark): If kidney damage is suspected, the patient’s urine is likely to be tested for the protein albumin. Explain why the presence of albumin in the urine indicates ki
  36. June 2017, Paper 1, Q6 (1 mark): Patients with kidney failure can be treated in different ways. Which of the following statements describes a feature of peritoneal dialysis? 1 Urea and mineral
  37. June 2017, Paper 1, Q9 (1 mark): The hormone hCG can be detected in urine using pregnancy tests. Which of the following properties of the hormone hCG allows it to be detected in urine? A hCG is
  38. June 2017, Paper 1, Q12 (1 mark): The image below shows the structure of the nucleotide base guanine. O N NH N NH2 N H Bird droppings are known as guano because they contain a high proportion of
  39. June 2017, Paper 1, Q17(a)(i) (2 marks): Calculate the order of magnitude by which concentration of copeptin in the faeces is higher than the concentration of C-reactive protein in the saliva. Show you
  40. June 2017, Paper 1, Q17(a)(ii) (2 marks): Suggest why blood and faeces have the highest concentrations of C-reactive protein and copeptin. [2]
  41. June 2017, Paper 1, Q22(a)(i) (1 mark): Which letter identifies the region with the highest hydrostatic pressure? [1]
  42. June 2017, Paper 1, Q22(a)(ii) (1 mark): Which two letters identify regions that do not contain plasma proteins? [1]
  43. June 2017, Paper 1, Q22(b)(i) (3 marks): Using this information and your own knowledge, compare the processes occurring in the proximal and distal convoluted tubules. [3]
  44. June 2017, Paper 1, Q22(b)(ii) (2 marks): Nephrogenic diabetes insipidus is a disease of the kidney that affects the regulation of water potential in the blood. One cause is lithium poisoning. Lithium i

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